refactor: Significantly refactor how conditions work internally (#1886)

- Much improved API cleanliness and testability to allow further
extensibility in future
 - Simplified code in `live` view

This technically contains a small change in how overrides work in the
`live` view. Since that change is _closer_ to the documentation, and
since this is likely to be rarely used, this is not considered a
breaking change. Previously, overrides for a given live camera would
always render _as if_ that camera was selected, vs was actually
selected. Now, overrides will only apply in the live view when the
camera is _actually_ selected. If this is an issue for you in practice,
lets discuss.

src/card-controller/media-info-manager.ts

@@ -30,7 +30,7 @@ export class MediaLoadedInfoManager {
     this._current = mediaLoadedInfo;
     this._lastKnown = mediaLoadedInfo;
 
-    this._api.getConditionsManager().setState({ mediaLoadedInfo: mediaLoadedInfo });
+    this._api.getConditionStateManager().setState({ mediaLoadedInfo: mediaLoadedInfo });
 
     // Fresh media information may change how the card is rendered.
     this._api.getStyleManager().setExpandedMode();
@@ -47,7 +47,7 @@ export class MediaLoadedInfoManager {
 
   public clear(): void {
     this._current = null;
-    this._api.getConditionsManager().setState({ mediaLoadedInfo: null });
+    this._api.getConditionStateManager().setState({ mediaLoadedInfo: null });
   }
 
   public has(): boolean {